Decommissioning 2003 Exchange server that's been offline for almost 3 years

We have three Exchange 2003 SP2 servers. Two are back end one is a front end. Almost three years ago, we had only a front end and back end server. Our office was moving so we brought a third server online to deliver mail to the new location as we moved. Once that was completed, we turned the server off.

During the time it's been off we've upgraded our domain from W2K to W2K8.

Now we are ready to move to Exchange 2007. My question is this, can we turn on the dormant Exchange 2003 server, have it touch the network and after a couple of hours attempt to un-install Exchange from it? Seems it would be better to attempt a graceful un-install rather than rip it out of AD.

However I wanted to see if others have had to make this choice and if there are any potential "gotchas" to having the old server back online.

if there is nothing in the old server, and you plan to format it, why do you want to waste time in unstalling exchange from it.
just remove it from adsiedit.msc
path is
open adsiedit.msc
expand configuration
expand services
expand microsoft exchange
expand the exchange org
expand administrative groups
expand your administrative group
expand servers

over here you would see the servers listed
delete the one that is not required.

Fair enough. I failed to mention that there is a legacy routing group that this server is a part of and that one existing Public calendar on the production server was synced with the old server before it went offline.

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

remove the old server from connector. should not cause any problems as the new server is also a member and everything is working fine when the old server is down.
any messages in the queues for the old server?

well, If everything is working fine and I need to remove an old server that has been down for quite some time, don't uninstall, i just remove it from adsiedit.
uninstall is also an option and you can use that.

i recommended adsiedit.msc path just to save time.
recommended is to uninstall gracefully.

and to remove the server from adsiedit.msc, you don't need to turn on the old box as you can open adsiedit.msc from any server that has the windows support tools installed.

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